LTC1733 - Monolithic Linear Lithium-Ion Battery Charger with Thermal Regulation
Features
- Complete Linear Charger for 1-Cell Lithium-Ion Batteries
- Thermal Regulation Maximizes Charging Rate without Risk of Overheating*
- No External MOSFET, Sense Resistor or Blocking Diode Required
- Up to 1.5A Charging Current
- Preset Charge Voltage with 1% Accuracy
- Programmable Charge Current with 7% Accuracy
- Programmable Charge Termination Timer
- Tiny Thermally Enhanced 10-Pin MSOP Package
- Charge Current Monitor Useful for Gas Gauging*
- C/10 Charge Current Detection Output
- Automatic Recharge
- Thermistor Input for Temperature Qualified Charging
- AC Present Logic Output
- 4.1V/4.2V Pin Selectable Output Voltage
Typical Application
Description
The LTC™1733 is a standalone constant-current/constant-voltage linear charger for lithium-ion batteries with an on-chip power MOSFET. Internal thermal feedback regulates the charge current to limit die temperature during high power operation or high ambient temperature conditions. This feature allows the user to program a high charge current without risk of damaging the LTC1733 or the handheld product.
No external current sense resistor is needed and no blocking diode is required due to the internal MOSFET architecture. The charge current and charge time can be set externally with a single resistor and capacitor, respectively. When the input supply (wall adapter) is removed, the LTC1733 automatically enters a low current sleep mode, dropping the battery drain current to less than 5µA.
The LTC1733 also includes NTC temperature sensing, C/10 detection circuitry, AC present logic, 4.1V/4.2V pin selectability and low battery charge conditioning (trickle charging).
The LTC1733 is available in a 10-pin thermally enhanced MSOP package.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC1733EMSE#PBF | MS-10E | MSE | E | 05-08-1664 | Yes |
| LTC1733EMSE#TRPBF | MS-10E | MSE | E | 05-08-1664 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC1733EMSE#PBF | MS-10E | E | $2.19 | $1.85 | Yes | |
| LTC1733EMSE#TRPBF | MS-10E | E | $1.91 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC454A | LTC1733EMSE | Linear Battery Charger For One Li-Ion Cell, 1.25A Charge Current, Vin = 5V | $100.00 | |
| Buy Now | |||
Applications
- Cellular Telephones
- Handheld Computers
- Digital Still Cameras
- Charging Docks and Cradles
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LTC1733
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
